<template>
	<view>
		<my-search bgcolor="" redius="5" @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!--左侧的滑动区域-->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height:screenable+'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i===active?'active':'']" @click="activeChanged(i)">
						{{item.cat_name}}
					</view>
				</block>
			</scroll-view>
			<!--右侧的滑动区域-->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height:screenable+'px'}"
				:scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 标题 -->
					<view class="cate-lv2-tittle">/ {{item2.cat_name}} /</view>
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3"
							@click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon"></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//当前设备的可用高度
				screenable: 0,
				cateList: [],
				active: 0,
				cateLevel2: [],
				scrollTop: 0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.screenable = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods: {
			async getCateList() {
				// 发起请求
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				// 请求失败
				if (res.meta.status !== 200) {
					uni.$showMsg()
				}
				console.log(res)
				this.cateList = res.message

				this.cateLevel2 = res.message[0].children
			},
			activeChanged(i) {
				this.active = i
				//为二级分类赋值
				this.cateLevel2 = this.cateList[i].children
				//切换二级分类滚动条置顶
				this.scrollTop = this.scrollTop == 0 ? 1 : 0
			},
			gotoGoodsList(item3) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
				})
			},
			gotoSearch() {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;
	}

	.left-scroll-view {
		width: 120px;

		.left-scroll-view-item {
			background-color: #F7F7F7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			position: relative;

			&.active {
				background-color: #FFFFFF;

				&::before {
					content: '';
					display: block;
					width: 3px;
					height: 30px;
					background-color: aqua;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}

	.cate-lv2-tittle {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}

	.cate-lv3-list {
		display: flex;
		// 换行
		flex-wrap: wrap;

		.cate-lv3-item {
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;

			image {
				width: 60px;
				height: 60px;
			}
		}
	}
</style>